As to factory outsourcing, I think it's overall a net gain for humanity. Long term there is a finite number of countries and barring societal collapse eventually they will all end up 'developed'. It simply exposes other problems in the US like our horrible social safety net and endemic corruption. So, a small ~2-5% import tax is probably a net gain for US society.
The system is almost designed intentionally to allow the abuse of workers.
At what point do you feel the USA will have enough immigrants? It's already a nation of immigrants!
Second we directly befit from a mix of immigrants from all nations.
When net migration into and out of the US approaches zero. Until that point it's about how fast we can acculturate newcomers, which judging from history is "pretty damn fast".
I believe that the best way to avoid war is to invite everyone to the table, help everyone get richer, do better, be more invested in a peaceful world. In the modern world, war is a nightmare solution.
https://assets.weforum.org/editor/wHXSXEN_EkCmuj8Jnb9I6EVD9g...
What does "enough immigrants" even mean?